Coherent modes and turbulences observations with multi-channel Doppler reflectometer on experimental advanced superconducting tokamak

doi:10.1063/5.0008303

	Coherent modes and turbulences observations with multi-channel Doppler reflectometer on experimental advanced superconducting tokamak
	Feng, X.6,7; Liu, A. D.6,7; Zhou, C.6,7; Zou, X. L.5; Zhuang, G.6,7; Wang, T. B.4; Liu, Y.3; Wang, S. X.3; Li, Y. Y.3; Shi, T. H.3
刊名	PHYSICS OF PLASMAS
	2020-08-01
卷号	27
ISSN号	1070-664X
DOI	10.1063/5.0008303
通讯作者	Zhou, C.(zhouchu@ustc.edu.cn)
英文摘要	With a newly installed 5-channel W-band Doppler reflectometer (DR) in EAST tokamak, many interesting coherence modes and turbulences have been observed. In this paper, the tearing mode (TM), a novel inter-edge localized mode (ELM) electromagnetic mode, and the eigenmode geodesic acoustic mode (GAM) accompanied by a broadband quasi-coherent mode (QCM) during H-mode stage have been reported. The TM could be directly observed in both density fluctuation and perpendicular velocity fluctuation at the DR channel localized in the magnetic island region; moreover, many high-order TM frequency harmonics, dual turbulence peaks inside and outside the island separatrix, and strong flow shear across the island separatrix could also be observed. A high-frequency ( similar to 230 kHz) electromagnetic mode (toroidal mode number n=1) could be identified. The mode is generated dozens of milliseconds before the ELM crash and may affect the ELM dynamic process. The eigenmode GAM excited during the H-mode stage is generated near the top of the density pedestal and then propagates radially inward with a radial wavenumber of about 1 cm - 1. A broadband QCM with a frequency range of 20 - 100 kHz is always accompanied by eigenmode GAM and nonlinearly coupled with both GAM and the background turbulence from the bispectrum analysis. All these results convince the validity of the Doppler reflectometer in multi-scale measurement from the mesoscale to microscale.
资助项目	National MCF Energy RD Program[2018YFE0311200] ; National MCF Energy RD Program[2017YFE0301204] ; Natural Science Foundation of China[11635008] ; Natural Science Foundation of China[U1967206] ; Natural Science Foundation of China[11975231]
WOS关键词	GEODESIC-ACOUSTIC-MODE ; DISCHARGES
WOS研究方向	Physics
语种	英语
出版者	AMER INST PHYSICS
WOS记录号	WOS:000559321100001
资助机构	National MCF Energy RD Program ; Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/70861]
专题	中国科学院合肥物质科学研究院
通讯作者	Zhou, C.
作者单位	1.ENN Sci & Technol Dev Co Ltd, Langfang 065001, Peoples R China 2.Hebei Key Lab Compact Fus, Langfang 065001, Peoples R China 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China 4.CNNC, Southwestern Inst Phys, C-610200 Chengdu, Peoples R China 5.CEA, Inst Magnet Fus Res, F-13115 St Paul Les Durance, France 6.Univ Sci & Technol China, Dept Engn & Appl Phys, Hefei 230026, Anhui, Peoples R China 7.Univ Sci & Technol China, KTX Lab, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Feng, X.,Liu, A. D.,Zhou, C.,et al. Coherent modes and turbulences observations with multi-channel Doppler reflectometer on experimental advanced superconducting tokamak[J]. PHYSICS OF PLASMAS,2020,27.
APA	Feng, X..,Liu, A. D..,Zhou, C..,Zou, X. L..,Zhuang, G..,...&Liu, W. D..(2020).Coherent modes and turbulences observations with multi-channel Doppler reflectometer on experimental advanced superconducting tokamak.PHYSICS OF PLASMAS,27.
MLA	Feng, X.,et al."Coherent modes and turbulences observations with multi-channel Doppler reflectometer on experimental advanced superconducting tokamak".PHYSICS OF PLASMAS 27(2020).